Transformers Parallel Operation

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Machv1

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I need to draft a phasor diagram showing two 150 kva delta/Y transformers in parallel, and what happens to the current when they have matching impedances and when they have mismatched impedances. In addition, I need to size wires and breaker protection.
Does anyone have any examples they could send me, I researched the College library but came up empty, also looked on the internet not much help either. Hence my query to the forum. I have peiced a lot of it together, but when it comes to the circulating currents betweeen the the trasnformers and trying to draw it vectoraly ....it is difficult.
Regards,
Mach1
 
Machv1 said:
I need to draft a phasor diagram showing two 150 kva delta/Y transformers in parallel, and what happens to the current when they have matching impedances and when they have mismatched impedances. In addition, I need to size wires and breaker protection.
Does anyone have any examples they could send me, I researched the College library but came up empty, also looked on the internet not much help either. Hence my query to the forum. I have peiced a lot of it together, but when it comes to the circulating currents betweeen the the trasnformers and trying to draw it vectoraly ....it is difficult.
Regards,
Mach1
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Do the secondaries have to be in parallel? Much simpler problem if they are not.
 
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